The theory of labor value is an important part of Marxism theory. Marx focuses on the study of theory of labor value and experiences a development process: suspecting, approaching, confirming and innovating. Such process shows the creation and application of historical materialism in the study of political economy to realize the inherent combination of the theory of labor value and historical materialism, which leads to the further study from the perspective of history and makes it possible for the grasping of historical integrity of Marx's labor value theory through method and logic integrity.